<template>
 
	<view>
     
		<view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 建议搜索列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
    <view class="history-title">
      <text>搜索历史</text>
      <uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
    </view>
    <view class="history-list">
      <uni-tag :text="item" v-for="(item,i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
    </view>
    </view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
        //搜索关键词
        kw: '',
        //搜索结果列表
        searchResults: [],
        historyList: ['a','app','apple']
			};
		},
   onLoad() {
         this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
       },
    methods: {
      input(e) {
        //e.value 是最新的搜索内容
        //console.log(e.value)
        //清除 timer 对应的延时器
        clearTimeout(this.timer)
        //重新启动一个延时器，并把 timer 赋值给 this.timer
        this.timer = setTimeout(() => {
          //500毫秒内，没有触发新的输入事件，则为搜索关键词赋值
          this.kw = e.value
          //根据关键词，查询搜索建议列表
          this.getSearchList()
          console.log(this.kw)
        },500)
      },
      //根据搜索关键词，搜索商品建议列表
      async getSearchList() {
        //判断关键词是否为空
        if(this.kw === '') {
          this.searchResults = []
          return
        }
        //发起请求，获取搜索建议列表
        const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch', {query:this.kw})
        if(res.meta.status != 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      saveSearchHistory() {
        //直接把搜索关键词 push 到 historyList 数组中
        //this.historyList.push(this.kw)
        //将 Array数组转化为 Set 对象
        const set = new Set(this.historyList)
        //调用 Set 对象的 delete 方法，移除对应的元素
        set.delete(this.kw)
        //调用 Set 对象的 add 方法，向 Set 中添加元素
        set.add(this.kw)
        //将 Set 对象转化为 Array 数组
        this.historyList = Array.from(set)
        //调用 uni.setStorageSync(key,value) 将搜索历史记录持久化存储到本地
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      gotoDetail(item) {
        uni.navigateTo({
          //指定详情页面 URL 地址，并传递 goods_id 参数
          url: '/subpkg/goods_detail/goods_detail?goods_id=' +item.doods_id
        })
      },
      cleanHistory() {
        this.historyList = []
        //清空本地存储中记录的搜索历史
        uni.setStorageSync('kw','[]')
      },
       gotoGoodsList(kw) {
         uni.navigateTo({
           url: '/subpkg/goods_list/goods_list?query=' + kw
         })
       }
    },
    computed: {
      historys() {
        return[...this.historyList].reverse()
      }
    }
	}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.sugg-list {
  padding: 0 5px;
  .sugg-item {
    font-size: 12px0;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    display: flex;
    align-items: center;
    justify-content: space-between;
    .goods-name {
      // 文字不允许换行（单行文本）
      white-space: nowrap;
      //溢出部分隐藏
      overflow: hidden;
      //文泵溢出后，使用 ... 代替
      text-overflow: ellipsis;
      margin-right: 3px;
    }
  }
}

.history-box {
    padding: 0 5px;

    .history-title {
      display: flex;
      justify-content: space-between;
      height: 40px;
      align-items: center;
      font-size: 13px;
      border-bottom: 1px solid #efefef;
    }

    .history-list {
      display: flex;
      flex-wrap: wrap;

      .uni-tag {
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }


</style>
